CVE-2018-17867: The Port Forwarding functionality on DASAN H660GW devices allows remote attackers to execute arbitrary code vi

This month

HIGH 7.2MITIGATE

CVE-2018-17867 is a high-severity flaw (CVSS 7.2) affecting h660gw firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Port Forwarding functionality on DASAN H660GW devices allows remote attackers to execute arbitrary code via shell metacharacters in the cgi-bin/adv_nat_virsvr.asp Addr parameter (aka the Local IP Address field).

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	3.8% (top 10%)
CISA exploited list	No
Weakness	CWE-78
Published	2018-10-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dasannetworks

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-10-01 23:29 UTCPublished CVE record published
2026-06-17 01:46 UTCUpdated Record last modified

dasannetworks h660gw firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-17867?

h660gw firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-17867 being exploited?

CVE-2018-17867 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-17867 affect?

CVE-2018-17867 affects h660gw firmware. Severity is high (CVSS 7.2). The Port Forwarding functionality on DASAN H660GW devices allows remote attackers to execute arbitrary code via shell metacharacters in the cgi-bin/adv_nat_virsvr.asp Addr parameter (aka the Local IP Address field).

How urgent is CVE-2018-17867?

Priority 53/100. High severity; Public exploit reference

Related CVEs

CVE-2018-17869 HIGH 8.8 MITIGATE DASAN H660GW devices do not implement any CSRF protection mechanism.
CVE-2018-17868 MEDIUM 4.8 MITIGATE DASAN H660GW devices have Stored XSS in the Port Forwarding functionality.

References

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